The received economic wisdom is that cities are too big and that public policy should limit their sizes. This wisdom assumes, unrealistically, that city sites are homogeneous, migration is unfettered, land is given freely to incoming migrants, and federal taxes are neutral. Should those...

The aim of this article is twofold. First, we present an integrative framework that encompasses a large share of existing neg models. This framework allows us to discuss the fundamental assumptions and the key results that hold throughout a broad class of models. We argue that progress within...